Imaginary Picture of K2-123 b

Display orbital revolution of K2-123 b around the hoststar K2-123
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Exoplanet Name : K2-123 b
Alternate Name : "K2-123 b, 2MASS J08574660+2127127 b, EPIC 212069861 b, EPIC 212069861.01, WISE J085746.59+212712.0 b"
Status : Confirmed
Radius (Rjup / Re): 0.2460 (Rjup) 2.7574 (Rearth)
Mass (Mjup / Me): 0.0213 (Mjup) 6.7761 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.1649 (AU) 0.1649 (AU Est.)
Eccentricity : 0.0600
Orbital Period(Yrs) 0.0847
Orbital Period(Observed/Estimated) 30.95 (Days Obs.) 31.06 (Days Est.)
Surface Gravity (G Earth) 0.8912
Star Radiation at Atmospheric Boundary: 4161.4 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 358.5 (K)
Blackbody T 0.3(K) 336.6 (K)
Blackbody T 0.7(K) 272.4 (K)
Tidally Locked Blackbody T 0.1(K) 426.3 (K)
Tidally Locked Blackbody T 0.3(K) 400.3 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-123
Alternate Name : "2MASS J08574660+2127127, K2-123, EPIC 212069861, WISE J085746.59+212712.0"
Star Distance(LY) : 528.6
Stellar Radius(Rsun) : 0.6 (Rsun Measured)
Stellar Mass(Msun) : 0.6 (Msun Measured) 0.6 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4035 (K)
Spectral type : M0V
UV portion[%]: 0.7
Visible portion[%]: 24.4
IR portion[%]: 74.9
Metalicity : 0.0
Absolute Magnitude: 5.9
Apparent Magnitude: 11.9
Right Ascension(RA) 134.4442
Declination (DEC) 21.4535
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-id?Ident=K2-123&submit=submit+id
Open Exoplanet Database Link
K2-123 b
K2-123 b

  • K2-123 b is an exoplanet orbiting the star K2-123, located about 528.6 light-years (162.1 pc) away from Solar System. Its discovery was publicly announced on 2017.
  • The host star K2-123 has apparent magnitude of 11.9, with absolute magnitude of 5.9.
  • It is 0.6 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 4035 with its spectral types of M0V
  • In this planetary system, the extrasolar planet K2-123 b orbits around the star K2-123 every 31.0 days with its orbital distance of 0.16 AU ( 24668688.9 km)
  • (Projected orbit of K2-123 b around its host star K2-123)


  • The Star K2-123 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.208 AU ( 31131296.1 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.288 AU ( 43031586.8 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.438 AU ( 65570615.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.645 AU ( 96490033.0 km)
  • Radiation at Planetary Boundary of K2-123 b : 4161.42 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-123)



  • Kopparapu Recent Venus for Star K2-123 distance : 0.233 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-123 distance : 0.295 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-123 distance : 0.285 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-123 distance : 0.313 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-123 distance : 0.559 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-123 distance : 0.589 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-123)



  • Original Kopparapu Recent Venus for Star K2-123 distance : 0.230 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-123 distance : 0.305 AU
  • Original Kopparapu Moist Greenhouse for Star K2-123 distance : 0.304 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-123 distance : 0.568 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-123 distance : 0.590 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-123)



    (Position in Stellar Map of star K2-123 and its Exoplanet K2-123 b)



    (Zoomed position in Stellar Map of star K2-123 and its Exoplanet K2-123 b (zoom level 3))

    (Synthetic Spectrum of star K2-123*)
    *Yamashiki YA et al. 2019 ApJ 881 114
    MUSCLES Paper I - France et al. 2016 ApJ 820 89
    MUSCLES Paper II- Youngblood et al. 2016 ApJ 824 101
    MUSCLES Paper III- Loyd et al. 2016 ApJ 824 102